phranque - 2:52 pm on Oct 22, 2012 (gmt 0)

this old thread still has some useful information.
Favicon Primer - Site Graphics and Multimedia Design forum:
http://www.webmasterworld.com/forum36/2385.htm [webmasterworld.com]

you could always try one of the online favicon validators to test your site's favicon or a .ico file.